running JPEG device on R 1.9.1 using xvfb-run on Linux

Does anybody have experience in running jpeg device using xvfb-run on
linux? I've been having sporadic problem with: /usr/X11/bin/xvfb-run
/usr/bin/R --no-save < Rinput.txt, with error saying: error in X11
connection. Especially when I run it from a perl script.

Not sure what `xvfb-run on Linux' is, as it is not on my Linux (FC3).
If you Google it you will find a number of problems reported on Debian 
lists.  Here I would suspect timing.

What I do is to run Xvfb on screen 5 by

Xvfb :5 &
setenv DISPLAY :5

and do not have a problem with the jpeg() or png() devices.  I do have a 
problem with the rgl() package, but then I often do on-screen (on both 32- 
and even more so 64-bit FC3).

Is there a better way of doing this? or how can I fix the problem.

You really should update your R.

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595